Tarsands containing large molecular hydrocarbons like crude oil are found in limited quantities in several parts of the world but the most important known occurrence is in:
Joseph Priestley and Carl Wilhelm Scheele both independently discovered oxygen in the year 1774, but Priestly is usually given credit for the discovery.
The Bill of Rights established the rights of citizens. It is also called as Declaration of rights or Charter of rights. It is a list of most important rights to the citizens of a country.